1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
#pragma once
#include <atomic>
#include <Storages/IStorage.h>
#include <Interpreters/IExternalLoaderConfigRepository.h>
#include <base/scope_guard.h>
namespace DB
{
struct DictionaryStructure;
class TableFunctionDictionary;
class IDictionary;
class StorageDictionary final : public IStorage, public WithContext
{
friend class TableFunctionDictionary;
public:
/// Specifies where the table is located relative to the dictionary.
enum class Location
{
/// Table was created automatically as an element of a database with the Dictionary engine.
DictionaryDatabase,
/// Table was created automatically along with a dictionary
/// and has the same database and name as the dictionary.
/// It provides table-like access to the dictionary.
/// User cannot drop that table.
SameDatabaseAndNameAsDictionary,
/// Table was created explicitly by a statement like
/// CREATE TABLE ... ENGINE=Dictionary
/// User chose the table's database and name and can drop that table.
Custom,
};
StorageDictionary(
const StorageID & table_id_,
const String & dictionary_name_,
const ColumnsDescription & columns_,
const String & comment,
Location location_,
ContextPtr context_);
StorageDictionary(
const StorageID & table_id_,
const String & dictionary_name_,
const DictionaryStructure & dictionary_structure,
const String & comment,
Location location_,
ContextPtr context_);
StorageDictionary(
const StorageID & table_id_,
LoadablesConfigurationPtr dictionary_configuration_,
ContextPtr context_);
std::string getName() const override { return "Dictionary"; }
~StorageDictionary() override;
void checkTableCanBeDropped([[ maybe_unused ]] ContextPtr query_context) const override;
void checkTableCanBeDetached() const override;
Pipe read(
const Names & column_names,
const StorageSnapshotPtr & storage_snapshot,
SelectQueryInfo & query_info,
ContextPtr context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
size_t threads) override;
/// FIXME: processing after reading from dictionaries are not parallelized due to some bug:
/// count() can return wrong result, see test_dictionaries_redis/test_long.py::test_redis_dict_long
bool parallelizeOutputAfterReading(ContextPtr) const override { return false; }
std::shared_ptr<const IDictionary> getDictionary() const;
static NamesAndTypesList getNamesAndTypes(const DictionaryStructure & dictionary_structure);
static String generateNamesAndTypesDescription(const NamesAndTypesList & list);
bool isDictionary() const override { return true; }
void shutdown() override;
void startup() override;
void renameInMemory(const StorageID & new_table_id) override;
void checkAlterIsPossible(const AlterCommands & commands, ContextPtr /* context */) const override;
void alter(const AlterCommands & params, ContextPtr alter_context, AlterLockHolder &) override;
Poco::Timestamp getUpdateTime() const;
LoadablesConfigurationPtr getConfiguration() const;
String getDictionaryName() const { return dictionary_name; }
private:
String dictionary_name;
const Location location;
mutable std::mutex dictionary_config_mutex;
Poco::Timestamp update_time;
LoadablesConfigurationPtr configuration;
scope_guard remove_repository_callback;
void removeDictionaryConfigurationFromRepository();
};
}
|
